Intro to Millwright Practice Exam 2025 – Comprehensive All-In-One Guide for Exam Success!

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What kind of metal lath is formed by a punch press to create an open mesh?

Expanded Metal

Expanded metal is formed by cutting and stretching a solid sheet of metal, creating an open mesh structure that allows for air and light to pass through. This process involves using a punch press to create diamond-shaped openings in the metal, which gives it its characteristic open mesh appearance. Expanded metal is known for its strength, durability, and resistance to deformation, making it suitable for various applications such as grating, fencing, and decorative purposes.

The other options do not accurately describe the formation of an open mesh through a punch press. Wire mesh consists of woven or welded wires, while perforated metal features a pattern of holes punched into a solid sheet but does not create the same open mesh structure as expanded metal. Expanded steel is not a standard term and is not used to describe a specific type of metal lath, further distinguishing expanded metal as the correct choice.

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Wire Mesh

Perforated Metal

Expanded Steel

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